How much does a 3.00 to 4.99ct I SI2 lab grown princess diamond cost?

As of October 2026, 3.00 to 4.99ct I SI2 lab grown princess diamonds typically cost $913 NZD to $59,188 NZD, with a median price of $1,537 NZD. There are currently 4 diamonds matching this specification available across retailers.

Where can I find the best price on a I SI2 princess diamond?

About 42% of these diamonds are available at multiple retailers, with an average price spread of 229%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct I SI2 Lab Grown Princess

Quick answer

As of October 2026, there are 4 lab grown princess diamonds with I colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $913 NZD to $59,188 NZD, with a median of $1,537 NZD. At least 17 retailers stock this exact specification, and 42% of the stones appear at more than one of them, with an average price spread of 229%. Half of all listings fall between $714 NZD and $4,048 NZD per carat. The same specification in natural form lists at a median of about $14,369 NZD per carat. Over the last 30 days the median price moved +7.0% and the number of listings moved -4.8%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Princess lab grown stones in the index: 461 USD per carat, -4.8% month on month. See the full index release

Figures come from current listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: October 2026

Available

Lowest Price

$587 NZD

Highest Price

$99,432 NZD

Average Price

$20,675 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

41.7%

Price Spread

228.7%

30-Day Price Trend

+7.0%

30-Day Supply Change

-4.8%

Volatility (30d)

0.03

Price Range

Price per carat distribution across retailers

$822/ct

10th Percentile

$287

Median

$822

90th Percentile

$2,779

Score Distribution

5 diamonds scored across 3 quality tiers

Very Good

2 (40.0%)

Good

2 (40.0%)

Average

1 (20.0%)

Find Your Diamond

Search 4 I SI2 princess diamonds and compare prices.

Search Diamonds

Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

I I1I1 inclusions are not visible without magnification

Save 84%

Related Specifications

D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 I IF I VVS1 I VVS2 I VS1 I VS2 I SI1